Mounts the EFI partition of the disk identified by the search string

mountefi.rb

#!/usr/bin/env ruby

search = "*1.0 TB"
efimnt = "/Volumes/EFI"

def run(cmd, &block)     
  puts "** #{cmd}"
  if block == nil
      system(cmd)
    else
      return IO.popen(cmd, &block)
    end
end

def efi_dev(lines, search)
  disk = nil
  lines.each do |line|
    match = /#{Regexp.escape(search)}.*(disk[0-9])/.match(line)
    if match
      disk = match[1]
    end
  end

  slice = nil
  lines.each do |line|
    match = /EFI.*#{disk}(s[0-9])/.match(line)
    if match
      slice = match[1]
    end
  end

  return "/dev/#{disk}#{slice}"
end

run("mkdir #{efimnt}")
efidev = run("diskutil list") { |out| efi_dev(out.readlines, search) }
puts "found #{efidev}"
run("mount -t msdos #{efidev} #{efimnt}")
run("open #{efimnt}")